二维流化床内水平射流横向脉动特性的研究  

Research on Lateral Fluctuations of Horizontal Jet in a Two Dimensional Fluidized Bed

作　　者：周亚明[1] 刘海滨[1] 沈湘林[1] 

机构地区：[1]东南大学热能工程研究所

出　　处：《东南大学学报（自然科学版）》1999年第3期120-129,共10页Journal of Southeast University：Natural Science Edition

基　　金：高等学校博士学科点专项科研基金

摘　　要：利用图像处理技术，得到了二维流化床内水平射流深度的时间序列．基于Ｒ／Ｓ分析方法，研究了流化数、射流速度和静态床层高度对水平射流横向脉动分数维的影响．结果表明，水平射流横向脉动随流化数的增加而加剧，随射流速度和静态床层高度的增加而减弱．探讨了水平射流横向脉动的原因，发现气泡与水平射流的合并是水平射流横向脉动的主要原因．The time series of jet penetration depth of horizontal jet in a two dimensional fluidized bed are acquired based upon digital image processing. Applying the scaled range ( R/S ) analysis, the effects of fluidization number,injection velocity and static bed height on fractal dimension of lateral fluctuations of horizontal jet are discussed. The results reveal that the lateral fluctuations is intensified with increase of fluidization number, and weakened with increase of injection velocity and static bed height. The primary reason for this is that bubbles coalesce with horizontal jet.

关 键 词：流化床 水平射流 脉动特性 射流 横向脉动 

分 类 号：TQ051.13[化学工程]